1. Preheat oven to 450°. 2. Remove casing from sausage. Cook sausage in a large nonstick skillet over medium-high heat until browned, stirring to crumble. Add onion, pepper, and mushrooms to pan; sauté 8 minutes or until tender. Stir in garlic; sauté 1 minute. Place crust on a large baking sheet....